<template>
  <div>
      <!-- 面包屑导航区域 -->
        <el-breadcrumb  separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert
                title="注意: 只允许为第三级分类设置相关参数!"
                type="warning" :closable="false" show-icon>
            </el-alert>

            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 选择商品分类的级联选择框 -->
                    <el-cascader
                        v-model="selectedCatKeys"
                        :options="cateList"
                        :props="cateProps"
                        @change="handleChange">
                    </el-cascader>
                </el-col>
            </el-row>

            <!-- tab页签 -->
             <el-tabs v-model="activeName" @tab-click="handleTabClick">
                 <!-- 添加动态参数 -->
                <el-tab-pane label="动态参数" name="many">
                    <!-- 添加参数按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
                                    {{ item }}
                                </el-tag>
                                <!-- 添加标签输入框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParamsById(scope.row)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性 -->
                <el-tab-pane label="静态属性" name="only">
                   <!-- 添加属性按钮 -->
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
                    <!-- 静态参数表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开行 -->
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
                                    {{ item }}
                                </el-tag>
                                <!-- 添加标签输入框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParamsById(scope.row)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加参数对话框 -->
        <el-dialog
            :title="'添加'+titleText"
            :visible.sync="addDialogVisible"
            width="50%" @close="addDialogClosed">
            <el-form ref="addFormRef" :model="addForm" :rules="addFormRules" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 修改参数对话框 -->
        <el-dialog
            :title="'修改'+titleText"
            :visible.sync="editDialogVisible"
            width="50%" @close="editDialogClosed">
            <el-form ref="editFormRef" :model="editForm" :rules="editFormRules" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      cateList: [],
      //  级联选择框配置对象
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 级联选择框双向绑定的数据
      selectedCatKeys: [],
      // 当前高亮页签名称
      activeName: 'many',
      // 动态参数数据
      manyTableData: [],
      // 静态参数数据
      onlyTableData: [],
      // 添加弹窗控制显示隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加参数验证规则
      addFormRules: {
        attr_name: [
          { required: true, trigger: 'blur', message: '请输入参数名称' }
        ]
      },
      // 编辑弹窗控制显示隐藏
      editDialogVisible: false,
      // 编辑参数的表单数据对象
      editForm: {
        attr_name: '',
        attr_id: ''
      },
      // 编辑参数验证规则
      editFormRules: {
        attr_name: [
          { required: true, trigger: 'blur', message: '请输入参数名称' }
        ]
      }
    }
  },
  created() {
    // 获取所有的商品分类数据
    this.getCateList()
  },
  methods: {
    // 获取所有的商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类失败')
      this.cateList = res.data
      console.log(this.cateList)
    },
    // 级联选择框选择时候触发
    handleChange() {
      // 获取参数列表数据
      this.getParamsData()
    },
    // tab页签点击事件处理
    handleTabClick(tab, event) {
      // 获取参数列表数据
      this.getParamsData()
    },
    // 获取参数列表数据
    async getParamsData() {
      // 证明选择的不是三级分类
      if (this.selectedCatKeys.length !== 3) {
        // 清空选中的分类集合
        this.selectedCatKeys = []
        // 清空动态参数集合
        this.manyTableData = []
        // 清空静态属性集合
        this.onlyTableData = []
        return
      }
      // 证明选择的是三级分类
      console.log(this.selectedCatKeys)
      // 根据所选分类的Id,和当前所处面版，获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) return this.$message.error('获取参数失败')
      // 处理attr_vals
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        // 控制文本框显示隐藏
        item.inputVisible = false
        // 文本框输入的值
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 关闭添加参数弹窗重置表单数据
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) return this.$message.error('添加参数失败')
        this.$message.success('添加参数成功')
        this.getParamsData()
        this.addDialogVisible = false
      })
    },
    // 点击按钮显示编辑参数弹窗
    showEditDialog(scope) {
      this.editDialogVisible = true
      this.editForm.attr_name = scope.attr_name
      this.editForm.attr_id = scope.attr_id
    },
    // 删除参数
    async removeParamsById(scope) {
      // delete  categories/:id/attributes/:attrid
      // 弹框提示参数是否要删除
      const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') return this.$message.info('取消参数删除')

      const { data: res } = await this.$http.delete('categories/' + this.cateId + '/attributes/' + scope.attr_id)

      if (res.meta.status !== 200) return this.$message.error('删除参数失败')

      this.$message.success('删除参数成功')
      // 更新参数列表
      this.getParamsData()
    },
    // 关闭编辑参数弹窗事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 点击确认按钮，编辑参数
    editParams() {
      // put categories/:id/attributes/:attrId
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) return this.$message.error('更新参数失败')
        this.$message.success('更新参数成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 文本框失去焦点或者按下enter键
    handleInputConfirm(row) {
      console.log('ok')
      // 输入值trim后为空 只需将input输入框进行隐藏
      if (row.inputValue.trim().length === 0) {
        row.inputVisible = false
        row.inputValue = ''
      } else {
        // 如果没有return,则证明输入的内容，需要做后续处理
        row.attr_vals.push(row.inputValue.trim())
        row.inputVisible = false
        row.inputValue = ''
        this.saveAttrVals(row)
      }
    },
    // 保存修改后的参数项
    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(',')
      })
      if (res.meta.status !== 200) return this.$message.error('修改参数项失败')

      this.$message.success('修改参数项成功')
    },
    // 点击按钮显示input
    showInput(row) {
      row.inputVisible = true
      // $nextTick 方法的作用 就是当页面上的元素被重新渲染后   才会指定回调函数的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数可选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    // 如果按钮需要被禁用，则返回true,否则返回false
    isBtnDisabled() {
      return this.selectedCatKeys.length !== 3
    },
    // 当前选中的三级分类id
    cateId() {
      if (this.selectedCatKeys.length === 3) {
        return this.selectedCatKeys[2]
      }
      return null
    },
    // 动态计算标题文字
    titleText() {
      return this.activeName === 'many' ? '动态参数' : '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
    .cat_opt {
        margin:  15px 0;
    }
    .el-tag {
        margin: 5px;
    }
    .input-new-tag {
        width: 120px;
    }
</style>
